<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">

  </div>
  <script src="../js/vue.js"></script>
  <script>
    Vue.createApp({
      template: `
      <div>
      <h2>{{message}}</h2>
      <h2>{{count}}</h2>
      <button @click="add">+</button>
      <button @click="decline">-</button>
    </div>
      `,
      data: function () {
        return {
          message: 'hello the world',
          count: 110
        }
      },
      methods: {
        add() {
          this.count += 1
        },
        decline() {
          this.count -= 1
        }
      }
    }).mount("#app")
  </script>
</body>

</html>